Ballraced stinger

[denboy01]

Ballraced Speedmaster Stinger

I’ve been using a home brewed ball raced version of a Speedmaster stinger for some time now.
A local machine shop counterbored the stinger 6mm diameter to the depth of the forward ballrace and brass tube spacers are used to keep the 3 bearings equally spaced over the length of the stubshaft. (see photo)
A little maintenance cleaning and oiling the bearings after a few runs keeps everything running smoothly.
All fitted to a Delta Force 26 hull which has had lots of use in different configurations, brushed and brushless setups up to 4s lipos, the bearings have yet to be replaced.
Not sure if it’s more efficient but the ballraced drivetrain ensures the prop runs straight and true.

[denboy01]

Ballraced stinger photo

Ballraced-stubshaft.jpg

[olwarbirds]

Thats nice ! I had asked several years ago now, as to why we dont see more stingers and struts with a bearing type support instead of a bushing. If I remember correctly, it had to do with failures and that the bushing was more reliable. I am currently doing a build using a .250 strut that I would prefer it having bearings supporting the prop shaft. I am not a machinist so making something is not an option. I dont know of a manufacturer who does make something like this.... DJ

[kfxguy]

I do my struts similar to this except I use 6 bearings. I use sealed bearings. The prop dose run much straighter and more true. It all adds up.

[olwarbirds]

Travis, I was going to call you about that. I need the .250 strut for my Drag Boat done for me... DJ

[kfxguy]

Travis, I was going to call you about that. I need the .250 strut for my Drag Boat done for me... DJ

Send me a pic of it. If I can do it I will.